https://preparationpoint.info/mathematics-mcqs/basic-maths-mcqs/assume-that-20-cows-and-40-goats-can-be-kept-for-10-days-for-rs-460-if-the-cost-of-keeping-5-goats-is-the-same-as-the-cost-of-keeping-1-cow-what-will-be-the-cost-for-keeping-50-cows-and-30-goats-for-2/